I just checked my old vectan manual and BA9 isnt listed for 44 special in there either.
If I was you, I would buy a tub of BA10 and use that for your powder puff loads.
In pistol days it was a go to powder for 38 special/44 special, 45acp and 45colt for target loads.
BA9 is more for mild magnum loads.
I still use both. Excellent powders.